nimble/audio: Add initial audio broadcast sink implementation

This adds initial implementation of audio broadcast sink.

nimble/host/audio/include/audio/ble_audio.h

@@ -68,6 +68,9 @@
 /** Broadcast Audio Broadcast Code Size. */
 #define BLE_AUDIO_BROADCAST_CODE_SIZE 16
 
+/** Basic Audio Announcement Service UUID. */
+#define BLE_BASIC_AUDIO_ANNOUNCEMENT_SVC_UUID 0x1851
+
 /** Broadcast Audio Announcement Service UUID. */
 #define BLE_BROADCAST_AUDIO_ANNOUNCEMENT_SVC_UUID 0x1852
 
@@ -576,6 +579,15 @@ struct ble_audio_broadcast_name {
 /** BLE Audio event: BASS - Set Broadcast Code */
 #define BLE_AUDIO_EVENT_BASS_BROADCAST_CODE_SET 6
 
+/** BLE Audio event: Broadcast Sink - PA Sync state */
+#define BLE_AUDIO_EVENT_BROADCAST_SINK_PA_SYNC_STATE 7
+
+/** BLE Audio event: Broadcast Sink - BIS Sync state */
+#define BLE_AUDIO_EVENT_BROADCAST_SINK_BIS_SYNC_STATE 8
+
+/** BLE Audio event: Broadcast Sink - Metadata Updated */
+#define BLE_AUDIO_EVENT_BROADCAST_SINK_METADATA 9
+
 /** @} */
 
 /** @brief Broadcast Announcement */
@@ -650,6 +662,56 @@ struct ble_audio_event_bass_set_broadcast_code {
  uint8_t broadcast_code[BLE_AUDIO_BROADCAST_CODE_SIZE];
 };
 
+enum ble_audio_broadcast_sink_sync_state {
+ /** Broadcast Sink Sync State: Not Synced */
+ BLE_AUDIO_BROADCAST_SINK_SYNC_STATE_NOT_SYNCED,
+
+ /** Broadcast Sink Sync State: Sync initiated */
+ BLE_AUDIO_BROADCAST_SINK_SYNC_STATE_INITIATED,
+
+ /** Broadcast Sink Sync State: Sync established */
+ BLE_AUDIO_BROADCAST_SINK_SYNC_STATE_ESTABLISHED,
+};
+
+/** @brief PA Synchronization state */
+struct ble_audio_event_broadcast_sink_pa_sync_state {
+ /** Source ID */
+ uint8_t source_id;
+
+ /** Sync state */
+ enum ble_audio_broadcast_sink_sync_state state;
+};
+
+/** @brief BIS Synchronization state */
+struct ble_audio_event_broadcast_sink_bis_sync_state {
+ /** Source ID */
+ uint8_t source_id;
+
+ /** BIS Index */
+ uint8_t bis_index;
+
+ /** Sync state */
+ enum ble_audio_broadcast_sink_sync_state state;
+
+ /** Connection Handle. Valid if `state` is @ref BLE_AUDIO_BROADCAST_SINK_SYNC_STATE_ESTABLISHED */
+ uint16_t conn_handle;
+};
+
+/** @brief Broadcast Sink Metadata changed */
+struct ble_audio_event_broadcast_sink_metadata {
+ /** Source ID */
+ uint8_t source_id;
+
+ /** BIS Index Mask */
+ uint8_t bis_sync;
+
+ /** Scan Delegator Subgroup: Metadata */
+ const uint8_t *metadata;
+
+ /** Scan Delegator Subgroup: Metadata length */
+ uint8_t metadata_length;
+};
+
 /**
  * Represents a BLE Audio related event. When such an event occurs, the host
  * notifies the application by passing an instance of this structure to an
@@ -715,6 +777,27 @@ struct ble_audio_event {
  * Represents a Broadcast Code baing set in BASS.
  */
  struct ble_audio_event_bass_set_broadcast_code bass_set_broadcast_code;
+
+ /**
+ * @ref BLE_AUDIO_EVENT_BROADCAST_SINK_PA_SYNC_STATE
+ *
+ * Represents a update of Broadcast Sink PA sync state.
+ */
+ struct ble_audio_event_broadcast_sink_pa_sync_state broadcast_sink_pa_sync_state;
+
+ /**
+ * @ref BLE_AUDIO_EVENT_BROADCAST_SINK_BIS_SYNC_STATE
+ *
+ * Represents an update of Broadcast Sink BIS sync state.
+ */
+ struct ble_audio_event_broadcast_sink_bis_sync_state broadcast_sink_bis_sync_state;
+
+ /**
+ * @ref BLE_AUDIO_EVENT_BROADCAST_SINK_METADATA
+ *
+ * Represents an update in Broadcast Sink Metadata.
+ */
+ struct ble_audio_event_broadcast_sink_metadata broadcast_sink_metadata;
  };
 };
 
@@ -950,6 +1033,21 @@ struct ble_audio_base {
  STAILQ_HEAD(, ble_audio_big_subgroup) subs;
 };
 
+static inline const char *
+ble_audio_broadcast_sink_sync_state_str(enum ble_audio_broadcast_sink_sync_state state)
+{
+ switch (state) {
+ case BLE_AUDIO_BROADCAST_SINK_SYNC_STATE_NOT_SYNCED:
+ return "not synced";
+ case BLE_AUDIO_BROADCAST_SINK_SYNC_STATE_INITIATED:
+ return "initiated";
+ case BLE_AUDIO_BROADCAST_SINK_SYNC_STATE_ESTABLISHED:
+ return "established";
+ default:
+ return "invalid";
+ }
+}
+
 /** @} */
 
 #endif /* H_BLE_AUDIO_ */